I have purchased this to fit with my recent purchase of Xiaomi 20W Qi Charger. it is probably the best fit if you want to use Tackform's joint arms together with Xiaomi 20W charger. I have looked into all other possible options, but without this, you can't play around with such versatility.
I have a couple mounts now. I use them on my motorcycle for phone and adapted one for satellite radio receiver mount. I can say they have worked perfectly so far, and the service/shipping has been good.